Headphone



FIG. 1 is a front, top, right perspective view of a headphone showing my new design;

FIG. 2 is a front, bottom perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof; and,

FIG. 5 is a bottom plan view thereof.

Portions in broken lines are for illustrative purposes only and form no part of claimed design. 

The ornamental design for a headphone, as shown and described. 